This is the GrimRacer 40x52 Three Blade Metal Boat Propeller from AquaCraft.

FEATURESConstructed of high quality Copper-Beryllium-Titanium material thatis rigid but not brittle and can be sanded and shaped with lesseffort than Stainless Steel propsCopper-Beryllium-Titanium material stays sharper longer and is lessprone to dulling and chippingTrue center bore hub with raised letters and numbering for easyidentificationTumbled to remove any excess cast flashing